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Home Q & A Board Science-Related Homework Help Mathematics Pre-calculus and Functions
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marinejas marinejas
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3 years ago
2 tan x / 1 - tan^2 x
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#1
Educator
3 years ago

marinejas Author
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#2
3 years ago
I think this one is wrong, the answer is supposed to be tan 2x
Answer accepted by topic starter
bio_manbio_man
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#3
Educator
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3 years ago
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marinejas Author
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#4
3 years ago
I've never heard about double angle identities, also a little confused on how it ended up getting to tan 2x, is there a simpler way to do this?
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#5
Educator
3 years ago
It's an identity, are you sure you haven't learned them?
marinejas Author
wrote...
#6
3 years ago Edited: 3 years ago, marinejas
do you know of there's an identity formula sheet, like for example, this question?
wrote...
#7
Educator
3 years ago
Double angle identities look like this:



Compound angle identities look like this:



All the other ones look like this:



By the way, I am moving all your "functions" -related topics over to the Pre-calculus & Functions category. Please start your new functions topics there.
marinejas Author
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#8
3 years ago
oh okay, thank you so much for the formulas, its just that my teacher showed us that the way to simplify 2 tan x / 1 - tan ^2 x was by breaking it up, like tan x + tan x/ 1 - (tan x)(tan x)
                                                                              = tan (x + x)
                                                                              = tan 2x
wrote...
#9
Educator
3 years ago
Quote from: marinejas (3 years ago)
oh okay, thank you so much for the formulas, its just that my teacher showed us that the way to simplify 2 tan x / 1 - tan ^2 x was by breaking it up, like tan x + tan x/ 1 - (tan x)(tan x) = tan (x + x) = tan 2x

Could you show me by hand (i.e. take a picture)? I can't seem to follow along your typed work
marinejas Author
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#10
3 years ago
Ok here
 Attached file 
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#11
Educator
3 years ago
I don't see anything wrong with these, they are right. So what seems to be the problem?
marinejas Author
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#12
3 years ago
the answers don't equal to the actual question
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#13
Educator
3 years ago
Is the question written the same way as the previous?
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